Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopy
Oxidation is one of the main failure modes of superalloys, and the initial oxidation of a superalloy provides clues for its failure analysis. NiCo-based superalloys exhibit superior mechanical properties, but their oxidation behaviour is still debatable, especially in terms of the ratio of Ni/Co. He...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424001340 |
| _version_ | 1797247874153578496 |
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| author | Yunsong Zhao Mingzhe Liu Junbo Zhao Hui Lu Shanshan Liu Yanhui Chen Dawei Pang Lilin Xie Ang Li Lihua Wang |
| author_facet | Yunsong Zhao Mingzhe Liu Junbo Zhao Hui Lu Shanshan Liu Yanhui Chen Dawei Pang Lilin Xie Ang Li Lihua Wang |
| author_sort | Yunsong Zhao |
| collection | DOAJ |
| description | Oxidation is one of the main failure modes of superalloys, and the initial oxidation of a superalloy provides clues for its failure analysis. NiCo-based superalloys exhibit superior mechanical properties, but their oxidation behaviour is still debatable, especially in terms of the ratio of Ni/Co. Here, we show the effect of the Ni/Co ratio on the initial oxidation behaviour at the nanoscale by in situ environmental transmission electron microscopy (ETEM), which provides the initial microstructural changes in the γ/γ′ structure-based alloy. The results indicate that Ni-rich alloys exhibit better structural stability at high temperatures than Ni-deficient alloys. A high content of Ni promotes the formation of a dense oxide layer, inhibits the oxidation rate, and improves the oxidation resistance. This result will help to elucidate the basic process of oxide formation in NiCo-based single-crystal superalloys and provide ideas for improving their oxidation resistance for alloy design. |
| first_indexed | 2024-03-08T11:53:17Z |
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| id | doaj.art-6870bbe700174200b525b6f0c63cea1f |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-24T20:05:37Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj.art-6870bbe700174200b525b6f0c63cea1f2024-03-24T06:57:22ZengElsevierJournal of Materials Research and Technology2238-78542024-03-0129779788Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopyYunsong Zhao0Mingzhe Liu1Junbo Zhao2Hui Lu3Shanshan Liu4Yanhui Chen5Dawei Pang6Lilin Xie7Ang Li8Lihua Wang9Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China; Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China; Corresponding author.Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, China; Corresponding author.Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100124, ChinaOxidation is one of the main failure modes of superalloys, and the initial oxidation of a superalloy provides clues for its failure analysis. NiCo-based superalloys exhibit superior mechanical properties, but their oxidation behaviour is still debatable, especially in terms of the ratio of Ni/Co. Here, we show the effect of the Ni/Co ratio on the initial oxidation behaviour at the nanoscale by in situ environmental transmission electron microscopy (ETEM), which provides the initial microstructural changes in the γ/γ′ structure-based alloy. The results indicate that Ni-rich alloys exhibit better structural stability at high temperatures than Ni-deficient alloys. A high content of Ni promotes the formation of a dense oxide layer, inhibits the oxidation rate, and improves the oxidation resistance. This result will help to elucidate the basic process of oxide formation in NiCo-based single-crystal superalloys and provide ideas for improving their oxidation resistance for alloy design.http://www.sciencedirect.com/science/article/pii/S2238785424001340NiCo-Based superalloysγ/γ′ structureIn situ oxidationETEMNi/Co ratio |
| spellingShingle | Yunsong Zhao Mingzhe Liu Junbo Zhao Hui Lu Shanshan Liu Yanhui Chen Dawei Pang Lilin Xie Ang Li Lihua Wang Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopy Journal of Materials Research and Technology NiCo-Based superalloys γ/γ′ structure In situ oxidation ETEM Ni/Co ratio |
| title | Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopy |
| title_full | Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopy |
| title_fullStr | Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopy |
| title_full_unstemmed | Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopy |
| title_short | Effect of the Ni/Co ratio on the structural and initial oxidation properties of NiCo-based superalloys revealed by in situ microscopy |
| title_sort | effect of the ni co ratio on the structural and initial oxidation properties of nico based superalloys revealed by in situ microscopy |
| topic | NiCo-Based superalloys γ/γ′ structure In situ oxidation ETEM Ni/Co ratio |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424001340 |
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